Select switching power supply need to pay attention to what
1Precautions should be taken when selecting switching power supply
1) Select the appropriate input voltage specification;
2) Choose the right power. In order to increase the life of the power supply, more than 30% of the output power rating can be selected.
3) Consider the load characteristics. If the load is a motor, light bulb or capacitive load, when the current is large at the start of the moment, the appropriate power supply should be selected to avoid overload. If the load is a motor, voltage backdown should be considered during shutdown.
4) In addition, it is necessary to consider the working environment temperature of the power supply, and there is no additional auxiliary cooling equipment, and the output of the power supply needs to be reduced in the excessive ring temperature. The derating curve of the ring temperature to the output power.
5) Select the functions required by the application:
Protection functions: over voltage protection (OVP), over temperature protection (OTP), over load protection (OLP), etc.
Application function: signal function (normal power supply, power supply failure), remote control function, telemetry function, parallel function, etc.
Special functions: Power correction (PFC), uninterruptible power supply (UPS)
6) Select the required safety and electromagnetic compatibility (EMC) certification.
2Precautions for using switching power supply
1) Before using the power supply, first determine whether the input and output voltage specifications are consistent with the nominal value of the power supply used;
2) Before power, check whether the input and output leads are connected correctly, so as not to damage the user equipment;
3) Check whether the installation is firm, whether the installation screw is in contact with the power board device, measure the insulation resistance of the shell and the input and output to avoid electric shock;
4) In order to ensure the safety of use and reduce interference, please ensure that the grounding terminal is reliably grounded;
5) The multi-channel output power supply is generally divided into main and auxiliary outputs, and the main output characteristics are better than the auxiliary output, and the main output with large output current is generally the case. In order to ensure the output load adjustment rate and output dynamic indicators, it is generally required that each channel has at least 10% load. If the auxiliary road does not use the main road, the main road must add appropriate false load. Refer specifically to the specifications of the corresponding model;
6) Please note: frequent switching of the power supply will affect its life;
7) The working environment and the degree of load will also affect its life.
